P0454
DTC P0454 EVAP. EMISSION SYSTEM-PRESSURE SENSOR INTERMITTENTComponent Location:
GENERAL DESCRIPTION
The evaporative emission control system prevents hydrocarbon vapors from escaping from the fuel tank into the atmosphere where they could form photochemical smog. Gasoline vapors are collected in the charcoal canister. The Fuel Tank Pressure Sensor (FTPS) is an integral part of the evaporative monitoring system. The PCM monitors the FTPS signal to detect vacuum decay and excess vacuum. The FTPS measures the difference between the air pressure inside the fuel tank and outside air pressure to check the purge control solenoid valve operation and for leak detection in the evaporative emission control system by monitoring pressure and vacuum levels in the fuel tank during the purge control solenoid valve operating cycles.
DTC DESCRIPTION
The PCM monitors pressure stability in the fuel tank by means of Fuel Tank Pressure Sensor (FTPS) for predetermined duration just before start the leakage monitoring to detect noise signal of pressure sensor. The PCM sets DTC P0454 if the pressure fluctuation is bigger than predetermined threshold.
If same error code is set in the next driving cycle, the PCM illuminates the MIL.
DTC Detecting Condition:
Schematic Diagram:
MONITOR DTC STATUS
NOTE: If any DTCs (or pending codes) relating to FTPS are present, do ALL REPAIRS associated with those codes befor9 proceeding with this troubleshooting tree.
1. Start engine to normal operating temperature.
NOTE: Evaporative Emissions Systems (EVAP) Leak Tests can be run by the Scan Tool The tests are automated and provide either a pass4all result or directions to check for DTCs.
2. Install scan tool and clear DTC
3. Perform "EVAP. LEAKAGE TEST" mode referring to enable conditions as below.
NOTE: EVAP Leakage Test enable conditions
1. Following conditions must be fulfilled to start the test.
a. Engine warm up at Idle Status
b. No relevant DTC
c. Fuel level is below 80%
4. Is DTC P0454 set again?
YES: Go to next step as below.
NO: Fault is intermittent caused by poor contact in the sensor's and/or PCM'S connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES: Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO: Go to "Fuel Tank Pressure Sensor(FTPS) inspection" procedure
VERIFICATION OF VEHICLE REPAIR
1. Return vehicle to original condition.
2. Start engine to normal operating temperature.
NOTE: Evaporative Emissions Systems (EVAP) Leak Tests can be run by the Scan Tool The tests are automated and provide either a pass-fail result or directions to check for DTCs.
3. Install scan tool and clear DTC
4. Perform "EVAP. LEAKAGE TEST" mode referring to enable conditions as below
NOTE: EVAP. Leakage Test enable conditions
1. Following conditions must be fulfilled to start the test
a. Engine warm up at Idle Status
b. No relevant DTC
c. Fuel level is below 80%
5. Monitoring for (pending) DTC. Is the same DTC set?
YES: Go to the applicable troubleshooting procedure.
NO: System performing to specification at this time.